anca noun "jaws, row of teeth" _(ÁNAK [there spelt anca in Etym as printed in LR, but according to VT45:5, Tolkien's own spelling in the Etym manuscript was anka], NAK [there spelt anka], Appendix E, SA - despite what Christopher Tolkien says in the entry _anca in SA, the Quenya word anca_ as such does NOT appear in the Sindarin dragon-name Ancalagon, but its Sindarin cognate anc does. See ÁNAK in the Etymologies.) Also name of tengwa #15 (Appendix E). _Despite its English gloss, anca is a singular word (in Etym the gloss is indeed "jaw", not "jaws").
Quenya
anca
noun. jaws, jaws; [ᴹQ.] jaw, row of teeth
anca
jaws, row of teeth
anca
noun. jaws
jaws, (animal's) mouth
anta
noun. jaw
A noun appearing as ᴹQ. anta “face” in The Etymologies written around 1937 under the root ᴹ√ANA “to, towards” (Ety/ANA¹), based on an extension of this root: ᴹ√ANAT (EtyAC/ANA¹).
Conceptual Development: The earliest appearance of this word was as ᴱQ. anta “jaw” in The Qenya Phonology of the 1910s, where it was derived from ᴱ✶mtā, related to ᴱ√MATA “eat” (PE12/26). It was mentioned again in the contemporaneous Gnomish Lexicon as a cognate to G. ant “cheek” (GL/19), but in the contemporaneous Qenya Lexicon and Poetic and Mythological Words of Eldarissa it was ᴱQ. anto “jaw” (QL/31; PME/31). ᴱQ. anta reappeared in Early Noldorin Word-lists of the 1920s, but there it had the gloss “cheek” and its Gnomish cognate G. ant was “face” (PE13/137, 160). In Early Qenya Word-lists from the 1920s, however, anta retained the gloss “jaw” (PE16/136).
As noted above, in The Etymologies ᴹQ. anta had the gloss “face” and a new derivation from ᴹ√ANA “to, towards” (Ety/ANA¹), perhaps meaning “✱front of the head”. In that document Tolkien introduced ᴹQ. anka for “jaw” based on ᴹ√NAK “bite” (Ety/NAK). In notes on The Feanorian Alphabet from around this time, he revised the gloss of ᴹQ. anta from “jaw” to “face” (PE22/21 note #64), which was followed by a chart that had both anta “face” and anka “jaw” (PE22/22). However, he then wrote “jaw” faintly above anta and marked through the gloss of anka (PE22/22 note #67).
In version of these notes on The Feanorian Alphabet from the 1940s, Tolkien had anta “jaws”, but there it was revised to ᴹQ. anto “mouth” (PE22/50 and note #185). In the version of Tengwesta Qenderinwa from around 1950 (TQ2) Tolkien again had Q. anta “jaw” < ✶amtā based on the root √MAT, but he revised the primitive form to ✶ankā and then marked through the entire paragraph (PE18/85 note #72). In the tengwar charts from Appendix E of The Lord of the Rings, Tolkien had Q. anca “jaw” and Q. anto “mouth” (LotR/1123).
To summarize, it seems Tolkien revised the meaning of word anta from “jaw” >> “cheek” >> “face” in the 1910s through 1930s; then in the 1940s and 50s he considered restoring anta “jaw” but ultimately settled on Q. anca “jaw” and Q. anto “mouth”.
Neo-Quenya: Given the ultimate result above, I think it is possible that the sense ᴹQ. anta “face” < √ANA “to(wards)” from The Etymologies remains viable, and I would use the word anta with that meaning for purposes of Neo-Quenya. I would also let it retain its ᴱQ. meaning “cheek”, as we have no other Quenya words with this sense.
anta
noun. jaw, [ᴹQ.] face, *front of the head, [ᴱQ.] cheek; [Q.] jaw
cá
kâ
cá ("kâ") "jaw" noun(GL:37; later sources give anca)
ohta
war
ohta noun "war" (OKTA, KOT > KOTH). In the pre-classical Tengwar system presupposed in the Etymologies, ohta was also the name of tengwa #15 (VT46:7), but Tolkien would later call this letter anca instead changing its value from ht to nc.
nangwa
jaw
nangwa noun "jaw" (NAK)
ohta
noun. war
war, hostility
ohta
noun. war
ohta
noun. war
A noun for “jaws” appearing in The Lord of the Rings Appendix E as the name of tengwa #15 [f] (LotR/1123). ᴹQ. anka was first introduced in The Etymologies of the 1930s with the glosses “jaw, row of teeth” and derived from primitive ᴹ✶ankā under the root ᴹ√(A)NAK “bite” (Ety/ÁNAK, NAK).
Conceptual Development: In tengwar charts and other earlier documents from the 1930s up through the early 1950s, anca was in competition with an earlier word anta “jaw” < ✶amtā (earlier ᴱ✶ṃtā) based on the root √MAT “eat” (PE22/22, 51; PE18/85 note #72), but Tolkien ultimately settled on anca. Another early word that might be a precursor to anca is ᴱQ. kâ, cognate to G. gag “jaw” from the Gnomish Lexicon of the 1910s (GL/37).